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Stockholders' Equity - Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Outstanding RSUs and RSAs    
Released (in shares) (437,844)  
Weighted-average grant date fair value per share    
Released (in dollars per share) $ 21.16  
Restricted Stock Units    
Outstanding RSUs and RSAs    
Balance (in shares) 670,606 802,900
Awarded (in shares) 4,055,344 686,072
Released (in shares)   (809,567)
Cancelled (in shares) (490,587) (8,799)
Balance (in shares) 3,797,519 670,606
Vested and and expected to vest (in shares) 3,126,182 532,623
Weighted-average grant date fair value per share    
Balance (in dollars per share) $ 24.71 $ 8.65
Awarded (in dollars per share) 20.38 16.09
Cancelled (in dollars per share) 25.21 31.79
Balance (in dollars per share) 20.44 24.71
Vested and expected to vest (in dollars per share) $ 20.46 $ 24.80
Weighted-average remaining contractual term    
Balance 1 year 9 months 18 days  
Vested and expected to vest 1 year 7 months 6 days 1 year 8 months 12 days
Aggregate intrinsic value    
Balance $ 76,596  
Vested and expected to vest $ 63,055 $ 14,812